ANA (2021). Lagos y Lagunas Huayhuash (ANA) [gis dataset]. ANA. https://geosnirh.ana.gob.pe/server/rest/services/P%C3%BAblico/Lagunas/MapServer/36. last updated: 0001-01-01 (update frequency: Never). Lagos y Lagunas de Huayhuash. Key words: Huayhuash, Perú, Lagos y lagunas Open Geospatial Consortium Standards: dynamic vector tiles | | WMS (coming soon) | WFS (coming soon) ETL documentation

ETL for hh_lagunas_ana

######### # GDSC ETL is performed in two steps: shell script to ETL data into postgres # and then additional transformations with SQL in postGIS (if needed). #### ######### # Step 1 - bash script (pseudo code) #### # create directory structure and move into it mkdir -p /data/hh_lagunas_ana/{download,etl} && cd /data/hh_lagunas_ana # set update flag based on last update and update frequency do_update=0 if date() < last_update + update_frequency else do_update = 1 # download if update flag is set: if do_update == 1 then ogr2ogr -nln hh_lagunas_ana download/hh_lagunas_ana.json 'https://geosnirh.ana.gob.pe/server/rest/services/P%C3%BAblico/Lagunas/MapServer/36/query?where=1%3D1&geometry=%22xmin%22%3A-77.33%2C%22ymin%22%3A-10.7%2C%22xmax%22%3A-76.55%2C%22ymax%22%3A-9.8&geometryType=esriGeometryEnvelope&inSR=4326&spatialRel=esriSpatialRelIntersects&outFields=*&returnGeometry=true&outSR=4326&f=geojson' # load into postGIS with: ogr2ogr -lco GEOMETRY_NAME=geom -f PostgreSQL PG:"" download/hh_lagunas_ana.json -nlt multipolygon -nln hh_lagunas_ana ######### # Step 2 - SQL script (pseudo code): #### # remove duplicate points and make geometries valid: UPDATE hh_lagunas_ana SET geom=ST_MakeValid(ST_RemoveRepeatedPoints(geom)); # add local geometry column and reproject existing geometries into local EPSG: SELECT AddGeometryColumn ( 'hh_lagunas_ana', 'geom_local', 5387, 'multipolygon', 2 ); UPDATE hh_lagunas_ana SET geom_local=ST_MakeValid(ST_RemoveRepeatedPoints(ST_Transform(ST_Multi(geom),5387))); CREATE INDEX hh_lagunas_ana_geom_local_idx ON hh_lagunas_ana USING GIST (geom_local); NOTIFY pgrst, 'reload schema'; # Move into corrrect directory and create derivative directory in data package on osgeo cd /data/hh_lagunas_ana/ mkdir -p derived # Create shapefile of table in derivate directory on osgeo ogr2ogr -f "ESRI Shapefile" -overwrite derived/hh_lagunas_ana.shp PG:"" hh_lagunas_ana # Create downloadable tarfile of shp in derivative directory on osgeo rm -f derived/hh_lagunas_ana.shp.tar.gz tar -czf derived/hh_lagunas_ana.shp.tar.gz meta_dcat_hh_lagunas_ana.json -C derived hh_lagunas_ana.shp hh_lagunas_ana.prj hh_lagunas_ana.shx hh_lagunas_ana.dbf # Move into correct directory cd /data/hh_lagunas_ana/